American Tower Corporation
US ˙ NYSE ˙ US03027X1000

SecurityAMT / American Tower Corporation
InstitutionMackenzie Financial Corp
Latest Disclosed Ownership57,111 shares
Latest Disclosed Value $ 9,856,216
Mackenzie Financial Corp reports 33.69% decrease in ownership of AMT / American Tower Corporation

On May 13, 2026 - Mackenzie Financial Corp filed a 13F-HR form disclosing ownership of 57,111 shares of American Tower Corporation (US:AMT) valued at $9,856,216 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 18, 2026 disclosing 86,122 shares of American Tower Corporation. This represents a change in shares of -33.69% during the quarter. The current value of the position is $11,074,394 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

Upgrade to unlock premium data and export to Excel .

Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-13 2026-03-31 13F AMERICAN TOWER COM 03027X100 57,111 -29,011 -33.69 9,856 -35.11 0.0118
2026-02-18 2025-12-31 13F AMERICAN TOWER CORP COM 03027X100 86,122 -452,264 -84.00 15,190 -85.33 0.0180
2025-11-13 2025-09-30 13F AMERICAN TOWER CORP COM 03027X100 538,386 -95,225 -15.03 103,542 -26.06 0.1254
2025-08-13 2025-06-30 13F AMERICAN TOWER CORP COM 03027X100 633,611 152,154 31.60 140,041 33.67 0.1814
2025-05-07 2025-03-31 13F AMERICAN TOWER CORP COM 03027X100 481,457 -63,755 -11.69 104,765 4.77 0.1490
2025-05-02 2024-12-31 13F/A-2 AMERICAN TOWER CORP COM 03027X100 545,212 -271,881 -33.27 99,997 -47.38 0.1363
2025-02-20 2024-12-31 13F/A-1 AMERICAN TOWER CORP COM 03027X100 545,212 -271,881 99,997 0.1300
2025-02-14 2024-12-31 13F American Tower REIT 03027X100 545,212 -271,881 96,575 0.1386
2024-11-13 2024-09-30 13F AMERICAN TOWER CORP COM 03027X100 817,093 161,980 24.73 190,023 49.22 0.2644
2024-08-14 2024-06-30 13F AMERICAN TOWER CORP COM 03027X100 655,113 125,104 23.60 127,341 21.60 0.1892
2024-05-10 2024-03-31 13F AMERICAN TOWER CORP COM 03027X100 530,009 48,540 10.08 104,724 0.76 0.1509
2024-01-30 2023-12-31 13F AMERICAN TOWER CORP COM 03027X100 481,469 266,221 123.68 103,940 205.43 0.1568
2023-10-25 2023-09-30 13F AMERICAN TOWER CORP COM 03027X100 215,248 6,612 3.17 34,031 -16.37 0.0572
2023-08-03 2023-06-30 13F AMERICAN TOWER CORP COM 03027X100 208,636 3,695 1.80 40,692 -2.83 0.0617
2023-04-24 2023-03-31 13F AMERICAN TOWER CORP COM 03027X100 204,941 -1,758 -0.85 41,878 -4.37 0.0647
2023-02-14 2022-12-31 13F AMERICAN TOWER CORP COM 03027X100 206,699 -41,552 -16.74 43,791 -17.84 0.0731
2022-10-07 2022-09-30 13F American Tower REIT 03027X100 248,251 -11,577 -4.46 53,299 -19.74 0.0917
2022-08-10 2022-06-30 13F AMERICAN TOWER CORP COM 03027X100 259,828 61,682 31.13 66,409 33.41 0.1064
2022-05-13 2022-03-31 13F AMERICAN TOWER CORP COM 03027X100 198,146 12,067 6.48 49,778 -8.54 0.0667
2022-02-14 2021-12-31 13F AMERICAN TOWER CORP COM 03027X100 186,079 5,658 3.14 54,428 13.66 0.0733
2021-11-08 2021-09-30 13F AMERICAN TOWER CORP COM 03027X100 180,421 -8,554 -4.53 47,886 -6.20 0.0679
2021-08-11 2021-06-30 13F AMERICAN TOWER CORP COM 03027X100 188,975 -37,246 -16.46 51,050 -5.60 0.0710
2021-05-14 2021-03-31 13F AMERICAN TOWER CORP COM 03027X100 226,221 69,727 44.56 54,080 53.96 0.0824
2021-02-10 2020-12-31 13F AMERICAN TOWER CORP COM 03027X100 156,494 66,356 73.62 35,127 61.21 0.0759
2020-11-13 2020-09-30 13F AMERICAN TOWER CORP COM 03027X100 90,138 3,096 3.56 21,789 -3.18 0.0541
2020-08-13 2020-06-30 13F AMERICAN TOWER CORP COM 03027X100 87,042 -39,141 -31.02 22,504 -18.10 0.0602
2020-05-14 2020-03-31 13F AMERICAN TOWER CORP COM 03027X100 126,183 51,511 68.98 27,476 60.11 0.0883
2020-02-13 2019-12-31 13F AMERICAN TOWER CORP COM 03027X100 74,672 6,561 9.63 17,161 13.94 0.0422
2019-11-14 2019-09-30 13F AMERICAN TOWER CORP COM 03027X100 68,111 3,358 5.19 15,061 13.76 0.0396
2019-08-23 2019-06-30 13F/A-1 AMERICAN TOWER CORP COM 03027X100 64,753 -139,042 -68.23 13,239 -67.03 0.0342
2019-08-14 2019-06-30 13F AMERICAN TOWER CORP COM 03027X100 64,753 -139,042 13,239
2019-05-15 2019-03-31 13F AMERICAN TOWER CORP COM 03027X100 203,795 -39,051 -16.08 40,160 4.54 0.0969
2019-02-06 2018-12-31 13F AMERICAN TOWER CORP COM 03027X100 242,846 236,815 3,926.63 38,416 4,285.39 0.1010
2018-11-15 2018-09-30 13F AMERICAN TOWER CORP COM 03027X100 6,031 1,484 32.64 876 33.54 0.0021
2018-08-13 2018-06-30 13F AMERICAN TOWER CORP COM 03027X100 4,547 1,877 70.30 656 69.07 0.0017
2018-05-14 2018-03-31 13F/A-1 AMERICAN TOWER CORP COM 03027X100 2,670 1,236 86.19 388 89.27 0.0010
2018-05-14 2018-03-31 13F AMERICAN TOWER CORP COM 03027X100 2,670 388
2018-02-13 2017-12-31 13F AMERICAN TOWER CORP COM 03027X100 1,434 1,434 -46.29 205 -47.16 0.0005
2017-05-25 2017-03-31 13F/A-1 AMERICAN TOWER CORP COM 03027X100 0 -58,868 -100.00 0 -100.00
2017-02-14 2016-12-31 13F AMERICAN TOWER CORP COM 03027X100 58,868 57,096 3,222.12 6,221 2,995.02 0.0373
2016-11-15 2016-09-30 13F AMERICAN TOWER CORP COM 03027X100 1,772 -167,324 -98.95 201 -98.95 0.0013
2016-08-12 2016-06-30 13F AMERICAN TOWER CORP COM 03027X100 169,096 -28,904 -14.60 19,211 -5.22 0.1085
2016-05-12 2016-03-31 13F AMERICAN TOWER CORP COM 03027X100 198,000 7,359 3.86 20,269 9.66 0.1839
2016-02-12 2015-12-31 13F AMERICAN TOWER CORP COM 03027X100 190,641 4,235 2.27 18,483 12.70 0.1147
2015-11-13 2015-09-30 13F AMERICAN TOWER CORP COM 03027X100 186,406 21,197 12.83 16,400 6.41 0.0995
2015-08-13 2015-06-30 13F AMERICAN TOWER CORP COM 03027X100 165,209 -704 -0.42 15,412 -1.34 0.0836
2015-05-13 2015-03-31 13F AMERICAN TOWER CORP COM 03027X100 165,913 24,214 17.09 15,621 11.52 0.0823
2015-02-11 2014-12-31 13F AMERICAN TOWER CORP COM 03027X100 141,699 19,439 15.90 14,007 22.36 0.0715
2014-11-12 2014-09-30 13F AMERICAN TOWER CORP COM 03027X100 122,260 59,260 94.06 11,447 101.92 0.0574
2014-08-11 2014-06-30 13F AMERICAN TOWER CORP COM 03027X100 63,000 -43,411 -40.80 5,669 -34.93 0.0264
2014-05-14 2014-03-31 13F AMERICAN TOWER CORP COM 03027X100 106,411 5,032 4.96 8,712 7.66 0.0427
2014-02-11 2013-12-31 13F/A-1 AMERICAN TOWER CORP COM 03027X100 101,379 11,829 13.21 8,092 21.90 0.0409
2014-02-03 2013-12-31 13F AMERICAN TOWER CORP COM 03027X100 101,379 8,092
2013-11-12 2013-09-30 13F AMERICAN TOWER CORP COM 03027X100 89,550 -250 -0.28 6,638 1.02 0.0336
2013-08-20 2013-06-30 13F/A-1 AMERICAN TOWER CORP COM 03027X100 89,800 89,800 6,571 0.0313
2013-08-09 2013-06-30 13F AMERICAN TOWER CORP COM 03027X100 89,800 6,571 0.0314
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.